Question

It is an estimated 40,000 hour operating life.

Image text transcribed for accessibility:Figure PI4.29D shows a priming roll driven by rive gear to which the 1.2-kN force is applied. The bottom surface of the roll is in contact with a similar roll that applies a uniform (upward) loading of 4 N/mm. Select identical 200 series ball bearings for A and B. if the shaft rotates 350 rpm. Figure P14.29D